The Canon EF 70-200mm f/4L IS II USM Lens is a telephoto zoom lens designed for Canon EOS DSLR cameras. This lens is the successor to the popular Canon EF 70-200mm f/4L IS USM and comes with various improvements and updates. Here are some key features and specifications of this lens:

Focal Length: It covers a focal length range of 70-200mm, making it ideal for a wide variety of photography situations, including portraits, wildlife, sports, and more.
Aperture: The lens features a fixed maximum aperture of f/4 throughout its zoom range. This means you can maintain a consistent aperture setting as you zoom in and out.
Image Stabilization (IS): The "IS" in the lens name stands for Image Stabilization. This feature helps reduce the effects of camera shake, allowing you to capture sharper images, especially in low-light conditions.
USM Autofocus: The lens uses an Ultrasonic Motor (USM) for fast and accurate autofocus, making it suitable for capturing fast-moving subjects.
L-Series Optics: This lens is part of Canon's L-Series, which is known for its high optical quality, durability, and weather-sealing. It features high-quality glass elements to ensure sharp and high-contrast images.
Compact and Lightweight: Compared to its predecessor, this lens is more compact and lightweight, making it easier to carry and handle.
Minimum Focusing Distance: The lens can focus as close as 3.28 feet (1 meter) from the subject, which is useful for close-up shots.
Lens Construction: It is constructed with 20 elements in 15 groups, including one fluorite and two UD (Ultra-low Dispersion) elements to reduce chromatic aberrations and maintain image quality.
Filter Thread: The lens has a 72mm filter thread, allowing you to attach various filters and accessories.
Compatibility: This lens is designed for Canon EF mount cameras and is compatible with both full-frame and APS-C sensor cameras.

The Canon EF 70-200mm f/4L IS II USM Lens is a versatile and high-quality option for photographers who need a telephoto zoom lens with a constant aperture and image stabilization. It's suitable for a range of photography genres, including sports, wildlife, and portraiture.

Ideal for photographers on the move, the professional L-Series EF 70-200mm F/4L IS II USM is designed to deliver superb image quality for a range of subjects in a compact and lightweight design. Built to withstand the rigours of professional use, its robust and weather-sealed for durable performance and the constant f/4 maximum aperture ensures consistent exposures at every zoom setting for a truly versatile experience. With a 70-200mm zoom range suitable for landscape and photojournalism, this lens earns a permanent place in a travelling photographer’s kit bag.

Benefits

Incredibly versatile 70-200mm zoom range suited from portrait and sports photography to landscape and reportage
Shoot with confidence, even in poor light thanks to a 5-stop IS system that guards against blur from camera shake
Track fast-moving objects around the frame with precision, thanks to a quick ring-type
USM autofocusing system. Full-time manual override allows instant and instinctive adjustments to be made
The f/4 maximum aperture stays the same throughout the zoom range, ensures that once the correct exposure is determined and set, it won’t change if you zoom to recompose legendary L-Series build quality inspires confidence, with weather sealing that protects against dust and moisture
Reduce ghosting and flare with Super Spectra coatings
Compact go-anywhere design, weighing just 780g, is ideal for travel

DSLR cameras and EOS-M mirrorless cameras with an EF-EOS M Mount adapter